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@ 2013-12-07T04:34:15Z

<?php

$var=4;

if (preg_match('/^[0-4]*$/', $var)) {
    echo $var . " is ok";
 } else {
    echo $var . " is NOT ok";}

Output
Performance
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References
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preg_match: documentation ( source)

preferences:dark modelive preview

37.17 ms | 402 KiB | 5 Q